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Synchronous sampling method for optical fiber longitudinal differential protection between digital transformer station and traditional transformer station

A technology of optical fiber vertical differential protection and traditional substations, which is applied in the direction of emergency protection circuit devices and electrical components to achieve the effect of improving reliability and safety

Active Publication Date: 2010-06-16
长园深瑞继保自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The realization of optical fiber longitudinal difference protection between traditional substations and digital substations plays a decisive role in improving the reliability and safety of power system operation, but the sampling synchronization between traditional substations and digital substations is the difficulty of realizing optical fiber longitudinal difference protection

Method used

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  • Synchronous sampling method for optical fiber longitudinal differential protection between digital transformer station and traditional transformer station
  • Synchronous sampling method for optical fiber longitudinal differential protection between digital transformer station and traditional transformer station
  • Synchronous sampling method for optical fiber longitudinal differential protection between digital transformer station and traditional transformer station

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Example 1, Inner Mongolia Duerbert substation is a fully digital substation, using Nanjing Xinning Optoelectronics Automation Co., Ltd. electronic CT and interval merging unit MU, line protection using Shenzhen Nari Technology Co., Ltd. PRS-753AO fiber longitudinal differential protection, Synchronization of the protection device with the bay merging unit takes the following steps:

[0047] 1. Power-on initialization, establish a communication link between the protection device and MU;

[0048] 2. According to the time when the protection device receives the data, the DSP (TMS320VC33) of TI (Texas Instruments Incorporated Chinese name: Texas Instruments) is used, and the Code Composer V4.10 compilation tool of TI is used to fine-tune the cycle of the timer. The specific code is as follows :

[0049] LDI @AW_ADDR_TIM1_CTRL, AR0;; close TIM1

[0050] LDI CW_TIM_CLOSE, R7;; 201H

[0051] STI R7, *AR0

[0052] ;; Determine whether the second frame of data ...

Embodiment 2

[0072] Example 2, Inner Mongolia Duerbert Substation is a digital substation. The line protection of this station adopts the PRS-753AO device of Shenzhen Nari Technology Co., Ltd., and the opposite side of the line is the Duerbert Wind Power Plant, which is a traditional electromagnetic transformer. The substation and line protection use the PRS-753A protection device of Shenzhen Nari Technology Co., Ltd., and the synchronization between the digital substation and the traditional substation adopts the following steps:

[0073] 1. After the MU on the digital station side and the protection device are synchronized, proceed to the following steps; if not synchronized, wait for the synchronization.

[0074] 2. The digital substation side protection device is set as the reference terminal, and the timing cycle of the traditional substation side protection device is continuously changed through the ping-pong algorithm. The DSP (TMS320VC33) of TI Company is used, and the Code Composer V...

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Abstract

The invention discloses a synchronous sampling method for optical fiber longitudinal differential protection between a digital transformer station and a traditional transformer station, and aims to solve the technical problem of sampling synchronization. The method comprises the following steps of: firstly, realizing synchronization between a protective device and an interval merging unit in the digital transformer station; and secondly, realizing synchronization between the digital transformer station and the traditional transformer station. Compared with the prior art, the synchronization between the protective device and the interval merging unit in the digital transformer station is realized by adopting frequency tracking, and the synchronization between the digital transformer station and the traditional transformer station is realized by using a ping-pong principle, so the realization of the optical fiber longitudinal differential protection between the two stations becomes possible and the running reliability and safety of an electric power system are greatly improved.

Description

technical field [0001] The invention relates to a method for relay protection of a high-voltage power grid, in particular to a sampling method for optical fiber longitudinal differential protection. Background technique [0002] In the process of realizing substation automation, with the development of intelligent electrical appliances, especially the emergence of intelligent switches and electronic transformers, substation automation has entered a new stage of digitalization. The digital substation completely solves the magnetic flux TA saturation problem in the current transformer core and the AC-DC crosstalk problem of the secondary cable. It has the advantages of avoiding repeated construction and management automation, and is the trend of substation automation. However, the construction of a digital substation cannot be accomplished overnight. In the process of construction, there must be a digital substation using electronic transformers on one side of some lines, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 张兆云刘宏君俞伟国
Owner 长园深瑞继保自动化有限公司